texture-rectangle: Initialize is_foreign

So we don't read an initializes value later on. Caught by valgrind:

Conditional jump or move depends on uninitialised value(s)
  _cogl_object_texture_rectangle_indirect_free (cogl-texture-rectangle.c:105)
  _cogl_object_context_indirect_free (cogl-context.c:453)
  ...
  main (text.c:149)

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Reviewed-by: Neil Roberts <neil@linux.intel.com>

(cherry picked from commit 90415aae9495749a2a9e85fb17425a3c7f6a08c8)

cogl/cogl-texture-rectangle.c

@@ -174,6 +174,7 @@ _cogl_texture_rectangle_create_base (CoglContext *ctx,
   _cogl_texture_init (tex, ctx, width, height, &cogl_texture_rectangle_vtable);
 
   tex_rect->gl_texture = 0;
+  tex_rect->is_foreign = FALSE;
 
   /* We default to GL_LINEAR for both filters */
   tex_rect->gl_legacy_texobj_min_filter = GL_LINEAR;